steljes



No. 624,56l. Patented May 9, 1899.

w. s. STELJES.

STEP BY STEP PRINTING TELEGRAPH.

(Application filed Feb. 16, 1899.)

' 3 Sheets-Shee I.

(No Model.)

No. 624,56I. Patented May 9, I899. W. S. STELJES.

STEP BY STEP PRINTING TELEGRAPH.

(Application filed Feb. 18, 1899.) (N6 Model.) 3 Sheets$heet 2.

TNE NORRIS PETERS co, PHOTO-LUNG wAsnmgToN. a. c.,

No. 624,56l. Patented May 9, I899. W. S. STELJES.

STEP BY STEP PRINTING TELEGRAPH.

(Application filed Feb. 16, 1899.) (No Model.) 3 Sheets-Shaet 3.

Wibzessw. [7w I vUNITED STATES PATENT OFFICE.

WALTER SAMUEL STELJES, OF LONDON, ENGLAND.

STEP-BY-STEP PRINTING-TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 624,561, dated May 9,1899.

Application filed February 16, 1899. Serial No. 705,609. (No modell) Toall whom it may concern:

Be it known that I, WALTER SAMUEL STEL-.

JEs, engineer, a subject of the Queen of Great Britain, residing atMountview, Mount Pleasant road, South Tottenham, London, in the countyof Middlesex, England, have invented certain new and useful Improvementsin Stepby-Step Printing-Telegraphs, of which the following is aspecification.

I11 step-by-step printing-telegraphs it has before beenproposed to driveboth the type wheel and an axis for effecting the printing and feedingforward of the paper by weights or springs. It has also been proposed touse one magnet having two armatures, one for operating the escapementused for controlling the turning of the type-wheel and the. other foroperating the escapement used for controlling the turning of theprinting-axis.

My improvements relate to an improved construction and arrangement ofthe electromagnet and its armatures to allow of its being operated byvery light reverse currents from a magneto-machine'and also to improvedmeans for shifting the type-wheels along their axis to bring onetype-wheel into acting position when the other is moved away from thatposition. My improvements are shown in the drawings annexed. Figure l isa face View of the machine. Fig. 2 is a side elevation of theelectromagnet and the two axes whose revolution it controls,.the oneaxis carrying the type-wheels and the other controlling the printing andmoving forward of the paper. Fig. 3 is a partial plan view showing theseparts. Fig. 4 is a side view of the type-wheel axis when this axis is inthe position shown in Fig. 3. Fig. 5 is a similar view with some of theparts in a different position. Fig. 6 is an elevation of thetype-wheel-escapement armature, looking at the front face or thatadjacent to the magnet. Fig. 7 is an end view of the same; Fig. 8, anelevation of the rear face of the same. A and B are two trains ofwheels, each driven by a spring or weight. The train of wheels A drivesthe type-wheel axis '0, and the train of wheels B drives the axis D,which controls the printing and feeding forward of the paper. Y

O are type-wheels.

E are the core-pieces of the eleotromagnet. E are arms extendingsidewise from these cores in parallel planes at a distance apart fromone another.

G is an armature in front of the ends of the arms E and fixed centrallyupon a vertical axis G, one end of the armature being opposite to theend of one arm and the other end of the armature opposite to the end ofthe other arm. The armature is also divided across the middle and apiece of brass y or other non magnetic substance interposed between thetwo parts, thus interrupting the magnetic continuity of the armature ator about midway of its length.

H is an armature carried by a lever H below the lower ends of the coresE. The upper ends of the cores E are attached to one end of apermanentmagnet F. The other end of the permanent magnet comes at the back of thearmature G and very effectively magnetizes the two parts of thisarmature to one polarity, while the electromagnet-cores E are magnetizedto the opposite polarity.

By mounting the armature G upon a central axis in the above way, withone of its ends opposite to one arm E and its other end opposite to theother arm, the two armatures can, as shown, he kept at a considerabledistance apart from one another, so that the magnetic field acting uponthe one armature is well away from the magnetic field acting upon theother armature, and the armature H is but little, if at all, affected bythe magnetism of the permanent magnet F, whereas heretofore when onepolarized magnet has been used for operating upon two armatures the sidewise extensions or arms of the magnet-cores have been made to facetoward one another, and one end of a polarized rocking armature has beenarranged to oscillate to and fro between them. This armature and thearma ture in front of the ends of the magnet-cores have thus beenbrought into close proximity.

By dividing the armature G across the middle its movements are renderedperfectly steady and uniform and it responds readily to everyalternation of current, and although a slightly-stronger current may berequired by reason of the extent to which the magnetic circuit of theelectromagnet is completed through the armature being somewhat re theother end of the armature is repelled from the other arm E, and thearmature is thus rocked to and fro at the same time the armatu re H isattracted to the cores E and remains held up so long as alternatecurrents are passing. \Vhen the currents cease to pass, the armature Hdrops away from the magnetcores.

G is a tooth or pallet carried by an arm which extends from thearmature-axis G. As the armature is rocked this pallet engages firstwith the teeth of one escapement-wheel l, which is fast on thetype-wheel axis (J, and

then with the teeth of another escapementwheel I, which is alongside it,each movement allowing the esca1: ement-wheels to make a partial turn,and so the type-wheel axis 0 is allowed to revolve with a step-by-stepmovement so long as alternate currents are passing through the coils ofthe electromagnet.

The lever H, which carries the armature H, also carries two pallets I-lH against one or other of which a blade projecting from an arm D, whichis fast on the axis D, rests. The blade rests against the pallet H solong as the armature remains attracted to the magnet-cores E; butwhencurrents cease to pass and the armature drops the pallet 11 is movedaway from in front of the blade and the arm D makes approximately acomplete revolution. The blade upon it then comes against the pallet Hand is arrested by this pallet and remains arrested by it until thearmature H is again attracted. This movement carries the pallet H out ofthe way of the blade on the arm D, and the blade comes against thepallet 11 and is arrested by it until the armature again drops. to makea complete turn in the way above described, an eccentric D upon it liftsthe leverarm J, which turns on an axis at J, and then again lowers thisarm. The lever-arm car-- ries a roller J over which passes the strip ofpaper X to be printed on. When the leverarm is raised, it brings thepaper against whichever letter on the under side of the type wheel isopposite to it and causes this type to make its impression upon thepaper. V hen the leveragain descends, a pawl J acting upon aratchet-wheel fast with the roller J gives a partial turn to this rollerand so feeds forward the paper ready for the next impression.

The rocking movement of the armature G is limited by adjustable stops Gand the Whenever the axisD is allowed rocking of the lever H, whichcarries the armature H, is limited by similar adjustable stops H Thearmature H is also never allowed to come into absolute contact with thecores E of the electromagnets. Preferably also its face is covered withpaper or like material, so that the magnetic circuit of theelectromagnet is never absolutely complete through good magneticconducting metal, and therefore the fact of the armature H being held upto the magnet-cores E does not prevent the polarity of these cores beingvaried when a1- ternate currents are passed through the magnet-coils,and consequently does not prevent the polarity of the arms E, whichextend from the cores or pole-pieces, being in this way varied at eachreversal of current, so that they may serve to rock the armature G.

Two type-wheels O are, as shown, carried side by side on the type-wheelaxis C. These can be pressed endwise along the axis by a coiled spring0, but cannot turn around it.

K is a small metallic slide which passes through a slot formedtransversely through the axis 0. On the slide is a V-shaped projectionK. The boss 0 which carries the typewheels, carries at its end a smallroller 0 which by the action of the coiled spring 0 is always keptbearing against one or other inclined side of the V projection. lVhen itbears against one incline, one type-wheel is in position forprinting,and when it bears against the other the other type-wheel is inposition for printing. The two positions are shown in Figs. 4 and 5. Apin K restrains the slide from being moved too far in one direction. Alink K which is jointed to the axis 0 and to the slide, restrains theslide from being shifted too far in the opposite direction.

WVhenever the rotation of the type-wheel axis 0 is arrested at the timewhen one or other end of the slide K is opposite to the project-ion L onthe printing-lever and the printing-lever is lifted in the manner abovedescribed, the projection comes against the end of the slide and movesthe slide endwise, so causing the type-wheels to be shifted endwisealong the shaft, whereby the type-wheel which before was in actingposition is put out of action and the other takes its place.

What I claim is- IIO strument, the combination of the electromagnet, theside extensions from its two polepieces in planes at a distance apartfrom one another, the intermittently-driven printingaxis, itsescapement,.the armature operating said escapement carried opposite theends of the pole-pieces, the type-wheel, its intermittently-drivenaxis,its controlling-escapement, the armature operating said escapementand mounted centrally on an axis with its ends respectively opposite theends of the side extensions from the pole-pieces of the magnet andhaving its magnetic continuity interrupted at or about midway of itslength, the

permanent magnet magnetizing the polepieces to one polarity and the endsof the lastnamed armature to the opposite polarity, and means actuatedon the operation of the printing-axis to take an impression from thetypewheel.

2. In a step-by-step printing-telegraph the combination of thetype-wheel axis, the crossslide carried by it, the two type-wheels, thespring holding these wheels. up to the crossslide, the printing-lever bywhich the crossslide can be struck and shifted endwise when- I ever theprinting-lever is operated at a time and operating the printing-axisescapement, the armature operating the type-wheel-axis escapement andmounted centrally on an axis with its ends respectively opposite theends of the side extensions-from said pole-pieces and having itsmagnetic continuity interrupted at or about midway of its length, thepermanent magnet magnetizing the pole-pieces to one polarity and theends of the last-named magnet to the opposite polarity, the cam on theprinting-axis, the printing-lever which it operates, the cross-slidecarried by the type- Wheel axis in such a position that it may be struckby the printing-lever and shifted end- Wise whenever the printing-leveris operated at a time when one or other end of the slide is WALTERSAMUEL STELJ ES.

Witnesses:

WALTER J. SKERTEN, WILFRED OARPMAEL.

